Tools & consumables
- Basic hand tools: metric sockets and ratchet, extensions, combination wrenches (8–24 mm), screwdrivers, pliers.
- Torque wrench (range covering 10–200 Nm).
- Punch set and drift, soft-face hammer.
- Snap‑ring pliers.
- Long pick / small magnet for retrieving balls.
- Pick or small flat screwdriver for seals/gaskets.
- Feeler gauge or depth gauge (for checking detent travel/clearance).
- Clean rags, parts tray, brake cleaner or parts solvent.
- High‑temperature grease or gearbox assembly grease.
- Replacement parts: detent ball(s), detent spring(s), detent plate (or pawl/guide) and screw(s), shift lever bushings, gaskets/O‑rings for cover, fasteners if corroded. Have a new shift‑tower cover gasket or RTV sealant on hand.
- Optional/special: OEM Hino shift tower removal tool if required, service manual for torque/specs.

Safety first
- Park on level ground, apply parking brake, and chock wheels front and rear.
- Block and support vehicle if working beneath; use jack stands rated for the vehicle. Never rely on a jack alone.
- Put transmission in neutral before disconnecting linkage. If vehicle has air‑assisted components, bleed air system and isolate/lockout to prevent accidental movement.
- Disconnect battery negative terminal when working near electrical connections or when removing transmission sensors.
- Wear gloves and eye protection. Keep rags clear of rotating parts during testing.

Overview of task
The detent system holds the shift selector in gear positions. Repair usually means replacing worn detent ball(s), spring(s), and/or the detent plate/guide in the shift tower or transmission top cover. Procedure: access shift tower/detent housing, remove worn components, inspect mating surfaces, install replacements, set clearances, reassemble, test.

Step‑by‑step procedure
1) Preparation
- Gather replacement detent parts and gasket kit.
- Have service manual available for bolt torque and specific component locations for FG17/FG19.

2) Gain access
- Remove shift lever knob and lever trim/console panels to expose the shift lever base.
- If present, remove upper shift boot and shift tower cover (usually a plate with 4–6 bolts). Keep bolts organized.
- Mark linkage/lever orientation with paint or scribe for reassembly if applicable.

3) Isolate linkage and remove selector assembly
- Disconnect external shift linkage at the shift lever/selector (clevis pin, cotter pin, or snap pin). Support linkage to avoid bending.
- Remove bolts holding shift tower/selector housing to transmission. Lift tower straight up — it may require careful rocking to disengage from the selector shaft. Use an assistant or small pry against the housing edge if seized; protect mating faces.

4) Inspect internal detent parts
- With housing off, locate detent ball(s), spring(s) and detent plate or pawl. Typical layout: spring behind a ball that registers in slots on a rotating selector shaft; a plate holds springs/balls in place.
- Remove the detent plate screws or retaining pin. Carefully capture springs and balls — use a magnet/pick. Note orientation and order.
- Inspect balls for pitting/wear, springs for set/weakness, detent plate and selector shaft grooves/edges for wear and burrs. Inspect mating surfaces and shift shaft for excessive wear or scoring.

5) Replace worn parts
- Replace any pitted balls or weak springs. Replace detent plate if grooved or bent. Replace shift lever bushings if loose or worn.
- Clean mating faces and bores with solvent; remove old gasket material without gouging surfaces.

6) Install new detent components
- Grease the balls lightly with assembly grease (thin film). Insert springs and balls in correct positions. Use small pick to seat springs/balls while you fit the detent plate.
- Position detent plate and secure with new bolts or the original hardware torqued to spec. If the plate uses a locating dowel, ensure correct orientation.

7) Reassemble shift tower
- Fit a new gasket or apply RTV per manual instructions. Lower the shift tower onto the selector shaft carefully — ensure alignment so you don’t force or damage shift splines.
- Reattach tower bolts, tighten finger‑tight and then torque to factory specs in a cross pattern.
- Reconnect linkage and secure clevis or pins. Replace any split pins.

8) Check detent engagement and adjust
- Manually cycle the shift lever through all gear positions. You should feel positive stops/clicks with consistent resistance at each gear. Check for excessive play.
- Use a feeler gauge or depth gauge, per manual, to ensure detent clearance/step is within spec. If adjustable, adjust stop screws or linkage until feel and dimensions match manual specs.
- Refit shift boot, trim and knob.

9) Final torques and test
- Reconnect battery if disconnected.
- Start engine, apply parking brake, and test shifting both stationary and on a short road test. Confirm that the lever snaps into each gear and holds without undue force; ensure there is no popping out of gear.
- After test drive, recheck fasteners and linkage for tightness and leaks.

How tools are used (practical notes)
- Punch/drift and hammer: remove any roll pins or stubborn fasteners. Use a soft‑face hammer to avoid damaging cast faces.
- Snap‑ring pliers: remove retention rings that hold detent assemblies in place.
- Pick/magnet: retrieve balls and seat springs during reassembly without losing small parts.
- Torque wrench: critical for final fasteners — follow manual torque to avoid housing distortion or leaks.
- Feeler gauge/depth gauge: measure detent travel or the depth of ball engagement to ensure correct feel and prevent false engagement.

Replacement parts required (typical)
- Detent ball(s) and spring(s) (replace as a set).
- Detent plate/pawl and screws (if worn or bent).
- Shift lever bushings and seals/O‑rings.
- Shift tower gasket or RTV.
- Fasteners if corroded or stretched.
Always use OEM or equivalent quality parts.

Common pitfalls & how to avoid them
- Losing tiny parts (balls/springs): work over a tray, keep magnet/picks handy.
- Reusing worn balls/springs: always replace if any wear or loss of spring tension.
- Damaging mating surfaces with improper prying: use protective blocks and pry in safe spots.
- Incorrect reassembly orientation: photograph or mark parts before removal.
- Over‑torquing thin cover bolts: causes distortion and leaks — use torque wrench and follow spec.
- Not replacing gasket/contaminating interior: replace gasket and clean surfaces; keep dirt out of selector bore.
- Forgetting to bleed/secure air systems (if present): isolate air to avoid unexpected movement.
- Improper alignment when reseating tower: avoid forcing tower onto splines — verify correct alignment to prevent cross‑threading or shaft damage.

When to involve a shop
- If selector shaft or transmission internal grooves are heavily scored.
- If detent housing mating surfaces are damaged or cracked.
- If detent change doesn’t restore proper gear holding — may indicate internal transmission issues (fork wear, selector drum problems).

Finish
- Document parts replaced and torque values used for future reference.
- If uncertain about any torque specification or detent geometry, consult the Hino FG17/FG19 workshop manual or a qualified Hino transmission specialist.

No further questions.
rteeqp73

From the Archives: Hino FG Series Old footage of the Hino FG Series truck.

From the Archives: Hino FG Series Old footage of the Hino FG Series truck.

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